EP2530059A1 - Vorrichtung zur Wärmebehandlung, insbesondere von getrennten Materialien, zumindest durch Mikrowellenstrahlung - Google Patents

Vorrichtung zur Wärmebehandlung, insbesondere von getrennten Materialien, zumindest durch Mikrowellenstrahlung Download PDF

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Publication number
EP2530059A1
EP2530059A1 EP12170326A EP12170326A EP2530059A1 EP 2530059 A1 EP2530059 A1 EP 2530059A1 EP 12170326 A EP12170326 A EP 12170326A EP 12170326 A EP12170326 A EP 12170326A EP 2530059 A1 EP2530059 A1 EP 2530059A1
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EP
European Patent Office
Prior art keywords
enclosure
heat treatment
treated
tank
treatment device
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Granted
Application number
EP12170326A
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English (en)
French (fr)
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EP2530059B1 (de
Inventor
Frédéric Vandenbussche
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IDCO
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IDCO
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/12—Rotary-drum furnaces, i.e. horizontal or slightly inclined tiltable
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
    • F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
    • F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
    • F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
    • F26B11/0495—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis with provisions for drying by electro-magnetic means, e.g. radiation, microwaves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/34—Arrangements of heating devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/6402—Aspects relating to the microwave cavity
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/6408—Supports or covers specially adapted for use in microwave heating apparatus
    • H05B6/6411—Supports or covers specially adapted for use in microwave heating apparatus the supports being rotated
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/80—Apparatus for specific applications
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/001—Heating arrangements using waste heat
    • F26B23/007—Heating arrangements using waste heat recovered from the dried product
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
    • H05B2206/04—Heating using microwaves
    • H05B2206/046—Microwave drying of wood, ink, food, ceramic, sintering of ceramic, clothes, hair
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Definitions

  • the present invention relates to the improvement of a high-efficiency industrial heat treatment device, in particular for divided materials, such as grains, granulates, powders, pastes, liquids, etc., by microwave radiation.
  • the microwave heating technology is particularly suitable for this type of material because it allows a direct heating in the heart of the material for small thickness up to the order of magnitude of the centimeter. Many industrial applications use this highly efficient heating technique, especially in the field of drying and disinfection.
  • microwave heating lies in the homogeneity of cooking for which mixing between the particles of the material is essential. Since microwave heating is very selective, a relative movement of the particles between them is essential for a good homogeneity. Indeed, microwave heating depends on the permittivity of the material which varies as a function of temperature. As the grains are not strictly identical to each other (chemistry, grain size, homogeneity, dryness), it is sufficient for one grain to begin heating before the others to heat faster than the others and for the micro-radiation to waves "focuses" on him: this is the phenomenon of thermal runaway very common in microwaves. This phenomenon can be slightly attenuated by a movement of the whole in the microwaves field (solution of rotating plates or wave stirrers). But this solution is very inefficient because the particles are not moving relative to each other.
  • the most effective solution is a mixing of the material which allows a thermal exchange between particles by convection, conduction and, at higher temperature by radiation. This permanent exchange allows a precise balancing of the temperature of the particles at every moment.
  • documents WO-2004/068906 and WO-2004/068907 describe, respectively, a complete line of treatment of divided materials, from the granulation of the dough, to the cooling of the granules, and some technical features of the baking oven, particularly in the application to clay expansion.
  • These documents describe a rotating interior cavity for efficient mixing of the granules. This cavity consists of a concrete shell resting on a concrete bottom fixed on a metal plate.
  • the state of the art recommends the use of this type of material, the presence of metal in the microwave field was previously strongly discouraged and no measure or test have been established so far to study the behavior of the metal under microwave at high temperature, in particular above 500 ° C.
  • This concrete ferrule disengages from the bottom to evacuate the treated product.
  • This technology does not allow a seal for the fine products and causes problems of putting back in place after several cycles.
  • These documents describe another drain solution using a spiral attached to the inner face of the ferrule, which eventually allows the material to rise when reversing the direction of rotation of the ferrule.
  • this device is unsuitable for the emptying of technical products of small particle size (less than 1 mm) or spherical.
  • the present invention aims to overcome at least some disadvantages of the prior art by providing a heat treatment device, at least by microwave radiation, to improve the overall performance of the treatment and to provide a technical solution to an industrial application for the high temperature heat treatment, in particular of divided materials, in applications such as expansion, drying, inerting, transformation, vitrification ...
  • a heat treatment device in particular divided materials, at least by microwave radiation comprising a rotating bowl forming a cavity made of a refractory metal and low resistivity, rotated by means allowing vary its speed so as to optimize the stirring of the product to be treated, the tank being placed in a chamber sealed to microwaves, at least at the treatment frequency, communicating with at least one microwave generator and being provided with pivot means for modifying the inclination of the latter relative to the vertical, the enclosure also comprising means for introducing the material to be treated and means for emptying the treated material.
  • the impedance of the tank (7) is adjustable by means of adjustment (8f) in height of the tank (7).
  • the enclosure of the device comprises at least one outlet capable of discharging the treated material, by gravitation, following the pivoting of the latter.
  • a seal formed of a metal braid, is disposed between the enclosure and its cover so as to avoid leakage of microwave radiation.
  • a seal formed of a metal braid is placed between the enclosure and the rotating shaft causing the tank to avoid microwave radiation leakage.
  • the lid comprises a metal chute system, on its face opposite the rotating bowl, allowing the emptying of the treated material.
  • the enclosure, its lid and the rotating bowl are thermally insulated using insulating materials with low thermal inertia and transparent to microwave radiation, for example aluminosilicate fibers.
  • the insulating material of the cover is fixed on the latter by means of a fixing system compatible with microwave radiation.
  • the or all microwave generator (s) and waveguide (s) are mounted integral with the enclosure so as to pivot with the latter.
  • an automatic clamping system allows the unlocking and locking of the waveguide (s) so as to disengage and reassemble them to the enclosure during the pivoting of the latter.
  • At least one quartz window is disposed at each waveguide flange to prevent the rise of dust to the generator (s).
  • At least one air injection system is disposed on at least one waveguide to create an overpressure inside the latter and to prevent the spread of dust.
  • the heat treatment device comprises conventional non-microwave heating means so as to preheat the material to be treated.
  • the heat treatment device comprises, outside the enclosure, means for recovering the heat emitted by the treated material, this heat being transmitted to a heater, after the exit of the enclosure of the treated material, for heating, at least in part, the heater and preheat the material to be treated before its introduction into the enclosure.
  • the heat treatment device comprises means for measuring the temperature of the material to be treated so as to follow and / or regulate the heat treatment.
  • the technology resulting from the implementation of the invention is particularly suitable for heat treatments requiring the application of temperatures including, for example and without limitation, between 200 ° C and 1800 ° C.
  • the above-mentioned object is achieved by means of a heat treatment device, in particular of divided materials, by microwave radiation, allowing continuous or discontinuous injection of product to be treated in a rotating cavity.
  • the material to be treated is then stirred homogeneously and brought to a precise target temperature.
  • the product is mounted at the desired temperature by the combined effects of microwaves, conduction, convection, radiation and from the interaction of the granules between them produced by the stirring.
  • Other sources of heat can be added to increase the efficiency of the device, such as hot air or infrared radiation.
  • the innovative design of the cavity, its thermal insulation, and its swing-off kinematics allow a much higher efficiency than the prior art and easy maintenance.
  • At least one microwave frequency generator (20) can be included, for example and without limitation, between 300 MHz and 6000 MHz, and preferably around the standard frequencies of 2450 MHz. MHz or 915 MHz, is connected via at least one waveguide (21) and flanges (33) to an enclosure (1).
  • the microwave generator or generators are intended to provide the energy required for the heat treatment of the material to be treated (P). Other sources of heat can be added to increase the efficiency of the treatment such as, for example, hot air or infrared radiation.
  • the enclosure (1) can have dimensions included, for example and without limitation, between 300mm and 2500 mm.
  • One or more air inlet ports (210) may be placed on the waveguides (21) to allow, for example, their dedusting or cooling.
  • the flanges (33) connecting the waveguide (21) to the inlet guide (3) can be provided with a quick locking / unlocking system (32), for example and without limitation, by compressed air.
  • a quick locking / unlocking system 32
  • At least one window (34), for example made of quartz, or any other equivalent material that is transparent to microwaves, can also be placed between the flanges (33) in order to avoid a rise in dust in the waveguide (21) produced, for example, during heating cycles.
  • the enclosure (1) is pivotally mounted, for example, on a base (50) via an axis (31) passing, for example, by the center of gravity of the enclosure (1).
  • Pivoting means such as a geared motor assembly (30) can allow to quickly rotate the enclosure (1) about its axis (31).
  • the material to be treated (P) may be stored in a silo (40) and then passed into a heater (41).
  • This heater (41) can use the hot air from the air cooling of the material leaving the oven, the hot air can be brought by a pipe (42).
  • This air then passes through the material to be treated (P) in the heater (41) before being discharged, for example, through an orifice (41a).
  • the material to be treated (P) reheated is sent via a pipe (43) into the enclosure (1) continuously or batch ( " batch " in English) depending on the use requested.
  • the cover (1b) of the enclosure (1) can be, for example, fixed on the enclosure by a set of screws (1c). Openings (4a), for example tubular orifices, can be arranged on the cover (1b) to allow, for example, measurements, such as for example and without limitation, temperature measurements, controls, the evacuation of the gases produced, sampling ...
  • the transformed material (Pe) can be evacuated by tilting in a cooler (44), for example, by air whose air flow is ensured. for example, by a fan (45).
  • An object of this cooler (44) is to accelerate the cooling of the material (Pe) after heat treatment.
  • Another purpose of this cooler is to recover the heat emitted by the treated material (Pe) after its exit from the enclosure (1), during the cooling step. Cooling the treated material (Pe) can, for example, be performed by circulating on the latter, a flow of air, for example, by means of a fan or any other type of equivalent means.
  • the hot air thus produced for example and without limitation, at 200 ° C for a treated material (Pe) at 900 ° C, can be directed, for example, to a heater (41) by a pipe (42) .
  • the treated material (Pe), once cooled, can then be stored, for example, in a hopper (46).
  • a waveguide (21) from a microwave generator may be connected to an input guide (3) communicating with the enclosure (1) by means of flanges (33) that can be locked and unlocked.
  • the locking / unlocking operations are performed rapidly and automatically, for example, by automatic locking and unlocking means, for example and without limitation by an automatic clamping system (32).
  • This automatic clamping system (32) may, for example, be a compressed air or electric system.
  • At least one quartz window (34), a material transparent to microwaves, can be inserted between these flanges (33) so as to prevent dust, for example from the mixing of material in the enclosure (1) to go up in the waveguide (21) while allowing the microwave radiation to pass.
  • an air stitching (210) may maintain an overpressure zone to cool that waveguide portion and / or to prevent dust from accumulating on the window (34). .
  • the enclosure (1) may have a cover (1b) fixed to the latter using, for example, screws (1c).
  • a peripheral microwave seal (50) such as, for example, a metal braid can be inserted between the lid (1b) and the enclosure (1) .
  • a quarter-wave joint, or quarter wave trap known device in the field of the art.
  • the lid (1b) may comprise openings (4a) or taps for, for example and without limitation, allow the entry of the material to be treated (P), the passage of the instrumentation, the output of the gases that can be produced by the heating of the material and / or to allow different checks to be carried out.
  • These connections (4a) are, for example, made in the form of tubes whose diameter may, for example and without limitation, be between 20 mm and 300 mm and the length, for example, between 50 mm and 300 mm. mm.
  • These dimensions can be determined according to the frequency used to prevent microwave radiation leakage. For example, and in known manner, these dimensions can be determined so that they are very small compared to the wavelength used in order to greatly attenuate the passage of electromagnetic waves and thus to avoid leaks.
  • These dimensions may be, for example, chosen less than one-tenth of the wavelength used or even smaller for a higher attenuation rate.
  • the cover (1b) can be thermally insulated using a standard insulating material (15) on its outer face, that is to say on the opposite side to the facing face. of the revolving bowl (7).
  • the insulating material may be rock wool over a thickness, for example equal to about 50 mm.
  • This insulator may, for example, be disposed on a thickness of about 50 mm on the underside of the lid, that is to say the face facing the rotating bowl (7).
  • This insulating material can be maintained, for example, by a system of effective and compatible fixations with microwave radiation with high power density so as not to cause arcing.
  • These fasteners may comprise a series of peripheral brackets (16c) metal, for example and without limitation, steel and preferably stainless steel.
  • These peripheral fasteners (16c) may, for example, be welded, on the inside of the cover (1b) and preferably welded, for example, at a minimum distance of about 10 mm from the inner wall of the enclosure (1 ), that is to say the wall facing the rotating bowl (7) to avoid the formation of electric arcs.
  • these fasteners will be welded along their entire length, by a continuous bead, to avoid any arcing.
  • These fasteners may also comprise a central fixing (16b) made, for example, using a rod fixed in the center of the inner face of the lid (1b) and on which is placed a washer from compressing the thermal insulation ( 16) against the inner face of the cover (1b), itself blocked, for example, by a system of nut and against nut.
  • this device can allow electrical continuity between the metal elements and a design to prevent the initiation of arcing.
  • the gap between the insulator (16) of the lid (1b) and the upper edge (2a) ) of this tank (7) must be minimized.
  • a metal chute (16a) can be placed on the insulator (16) and fixed on the inner face of the cover (1b). This chute (16a) can angularly cover the minimum surface required for the discharge of the treated product (Pe) corresponding to an angle of, for example, between 20 ° C and 90 ° C.
  • the metal used may be a type 304L stainless steel or a refractory steel with chromium / nickel, non-magnetic and low resistivity NS30 type depending on applications and processing temperatures.
  • the thickness of the metal vessel may be from 2 mm to 10 mm with a bowl diameter of 100 mm to 2500 mm and heights ranging from 100 mm to 30000 mm depending on the applications, powers and types of products.
  • the tank can be cylindrical. It may or may not include stirring blades. The ratio of the diameter of the tank to its height depends on the particle size, the dryness, the appearance, the plasticity, etc. of the product to be heated.
  • the steel tank has a thickness of 5 mm, a diameter of 1400 mm and a height of 1300 mm.
  • the general thermal inertia of the revolving bowl (7) can be minimized, for example, by the combination of a small metal wall thickness, for example, made of refractory stainless steel on its inner face ( 2) and a heat insulator (18) based for example on silica / magnesium or silica / alumina in the form of a fiber-reinforced sheet which allows high temperature withstand, up to about 1300 ° C., while having a very high low thermal inertia.
  • This thermal insulator (18) may, for example, be arranged to a thickness of about 50 mm on the outer face of the ferrule (2) of the rotating bowl (7), that is to say the face facing of the enclosure.
  • this insulating material (18) can be held in place between the upper edges (2a) and the bottom (5) of the tank (7), for example by strapping, for example, welded or thin metal wall.
  • This isolation device can, as required, be completed effectively, for example, by adding a coating (18b) of quartz-based material, or any other equivalent material reflecting infrared radiation and transparent to microwave radiation.
  • This coating (18b) may, for example, be arranged on the entire inner face of the rotating bowl (7) to a thickness, for example and in no way restrictive, of about 10 mm.
  • this coating (18b) minimizes the induced heating of the metal tank (7) by the infrared radiation from the product to be treated (P) heated by microwaves by reflecting this infrared radiation to the product.
  • the bottom (5) of the revolving bowl (7) may, like the shell (2), be made of metal and preferably of refractory stainless steel.
  • This bottom (5) can be attached to a metal drive plate (5b) using, for example, screw (5c).
  • these screws may, for example, be welded to the underside of the bottom (5), and be associated, for example, with washers and nuts (5c) so that there is a perfect electrical continuity between the bottom (5) and the ferrule (2), this to prevent the creation of arcing in an area of possible presence of microwave radiation.
  • a thermal insulation (5a), rigid or not, may be arranged between the bottom of the tank (5) and the support plate (5b) so as to avoid creating a thermal bridge at this level, and thus improve the insulation of the tank (7) to increase its yield.
  • This insulation must be compatible with its use in the electromagnetic field and may advantageously consist of laminated sheets based on muscovite mica paper.
  • the rotating bowl (7) can be rotated by a motor (9) via a drive shaft (8).
  • the drive shaft (8) of the rotating bowl (7) can be advantageously cylindrical so as to allow air to circulate through a rotary joint (8e).
  • This circulation can be used in conjunction with the dedusting and cooling of the rotary joint system (8e) and the guide zone (8d) which may include, for example, bearings (8c) or a plain bearing.
  • the rotary joint system (8e) can be designed with a support piece (8a) in which a microwave seal (51) can be housed, such as, for example, a metal braid making it possible to provide a good tightness to microwave radiation between the chamber and the shaft during the rotation of the tank (7).
  • a microwave seal (51) can be housed, such as, for example, a metal braid making it possible to provide a good tightness to microwave radiation between the chamber and the shaft during the rotation of the tank (7).
  • Another known solution in the field of the art is the use of a quarter-wave joint, or
  • adjustment means (8f) for example and without limitation, comprise a shim system that can easily slide between the emptying body (8d) and the bottom of the fixed vessel (1d), allowing height adjustment of the rotating internal cavity (7).
  • the displacement of the tank (7) causes a modification of the dimensions of the cavity formed by the tank (7) and the enclosure (1), which modifies the conditions of propagation of the microwave field.
  • This device ultimately allows a precise impedance adjustment of the cavity to optimize the performance thereof in the microwave.
  • This shim system can, for example and without limitation, be automated and replaced for example by a known threaded mechanical system or any other device allowing relative movement between the transmitter and the vessel (7).
  • the rotational drive of the tank (7) can be provided by a motor (9), for example, integral with the enclosure (1) and driving the shaft (8) for example to using a belt and gear system (9a).
  • this motor can be equipped with a speed variator which makes it possible to precisely control the speed of rotation of the tank, for example and in a non-restrictive manner, between 5 and 100 rpm.
  • the enclosure (1) has pivoting means for adjusting the inclination of the latter and therefore that of the rotating bowl (7). Adjusting the speed of rotation of the revolving bowl (7), associated with the adjustment of its angle of inclination, makes it possible to optimize the stirring according to the material to be used.
  • stirring blades (2b) made of steel, for example of the same nature as the ferrule (2) can be added according to the product (P) to be treated. Their attachment, for example continuously welded, will be such that there is a perfect electrical continuity with the shell (2) over the entire length of the weld so as to avoid the formation of electric arc.
  • the inclination of the enclosure (1) about an axis (31) passing through its center of gravity is preferably motorized in conjunction with the automatic clamping (32) of the guide or guide (s) waves (21).
  • This technical solution allows a significant decrease in the duration of the cycle time.
  • a second solution, according to the innovation, may be to perform the pivoting or tilting of the enclosure (1) integrally with that of the generators. This solution is described in more detail below and on figure 4 .
  • the wall of the latter may consist of a double metal skin (1 d, 1e) surrounding an insulating material (17).
  • the inner face (1e) of the enclosure (1) that is to say the face facing the vessel (7), is made of stainless steel.
  • the thermal insulation (17) between these two metal skins (1 d, 1e) not being subjected to the microwave field may be a standard insulator, not necessarily compatible with microwave radiation, for example and in a non-controlled manner. limiting, stone wool to a thickness, for example, of about 50 mm.
  • the enclosure (1) may have at least two outputs (4b, 4c).
  • these outputs can be designed with a shape of the enclosure (1), in a funnel, so as to allow the evacuation of all the treated product (Pe) without retention area.
  • These funnel shapes can be connected to metal tubular shapes, for example, of stainless steel whose diameter, for example between 20 mm and 300 mm and the length, for example, between 50 mm and 300 mm, can be determined depending on the frequency used to prevent microwave leakage.
  • the outlet (4b) can be placed on the upper part of the enclosure (1), that is to say the part closest to the cover (1b), when the latter is arranged in a vertical position as illustrated on the figure 2 .
  • the outlet (4b) then allows the evacuation of the treated material (Pe) during the inclination of the enclosure at an angle, for example between 40 ° and 180 ° relative to the vertical (V).
  • An outlet (4c) can be arranged, for example, on the lower part of the enclosure (1) so as to allow the evacuation, for example, the dust, residues, particles ejected from the cavity or the condensates of the wastewater. vaporization.
  • this outlet (4c) can be used for the evacuation of the treated material (Pe), for example, during the heat treatment of the material (P) continuously and emptying overflow or overflow.
  • This embodiment by densimetric sorting, is particularly suitable for materials to be treated (P) whose density decreases after heat treatment.
  • the material to be treated (P) is introduced continuously into the enclosure (1), for example, by at least one inlet (4a). After a determined heating time, the treated material (Pe) becomes lighter than the material to be treated or being treated and is found on the surface of the materials (P, Pe). The inclination of the chamber (1) then allows the treated material (Pe), lighter, to overflow the rotating bowl (7) to end up in the lower part of the chamber (1) and then escape naturally by gravity in drain means (4c) such as, for example, an outlet funnel.
  • drain means (4c) such as, for example, an outlet funnel.
  • FIGS. 4 and 5 are schematic views showing an exemplary embodiment of the heat treatment device according to the invention according to which the set (s) microwave generator (s) (20) and the enclosure (1) are rendered in the rotation operation.
  • the microwave generator (s) (20) and the enclosure (1) can pivot simultaneously about axes (31, 31b) having the same direction.
  • the enclosure (1) and the microwave generator (s) pivot about a same axis.
  • the enclosure (1) can receive one or more input guides (3) for the entry of microwave radiation inside the enclosure (1).
  • the inlet guides (3) must be designed in a non-symmetrical manner and with the widths (L) of the flanges perpendicular to each other, as illustrated figure 6 , to obtain an efficient coupling of the two microwave fields. Similar reasoning can be applied in the case of a higher number of microwave generators (20).
  • the generator (s) (20) can be fixed on a support (50b) allowing their rotation to rotate about an axis (31b) arranged in the same direction as the axis (31). rotation of the enclosure (1).
  • the rigid connection of the generators to the cavity allows a rotational drive of the generators (20) when the enclosure (1) is rotated to its emptying position.
  • two microwave generators can be coupled on the same enclosure (1).
  • the waveguides associated with these generators (20) can be fixed with the help of flanges on flanges (33a, 33b) of two inlet guides (3a, 3b) of the cover (1b).
  • these input guides (3a, 3b) are designed non-symmetrically and with the widths (L) of the flanges perpendicular to each other to obtain efficient coupling of the two microwave fields.
  • Their spacing is also sufficient to avoid the creation of arcs, for example and in no way limiting, greater than 150 mm.
  • the lid may have inlets (4a) consisting of, for example, tubes whose diameter, for example between 20 mm and 300 mm and the length, for example between 50 mm and 300 mm, are determined as a function of the micro frequency -waves used to prevent microwave leakage.
  • the cover (1b) can, for example, be fixed on the enclosure (1) with screws (1c).
  • an innovation lies in the use of a conventional non-microwave heating means (60), for example a rotary kiln, for preheating the material to be treated (P) in a economically advantageous manner, and not using the Microwave heating only for the final and technical phase of the heat treatment.
  • the product to be treated (P) is introduced preferentially into a heater (41) using, for example, the hot air resulting from the cooling of the treated material (Pe) at the outlet of the enclosure (1).
  • This air can be fed through a line (42), for example, to the lower level of the heater to obtain a countercurrent mixture with the product to be treated (P).
  • This enhanced air can then be evacuated by a chimney (41a).
  • the material to be treated (P) is then introduced, for example, continuously into a furnace (60) permitting preheating of the product to a temperature, for example, less than 100 ° C. to 300 ° C. of the target temperature for perform the heat treatment. In certain embodiments, this preheating temperature may be just below the critical point at which the desired chemical or physical transformations of the material to be treated (P) take place, for example a change state, expansion or any other transformations.
  • the preheated material (P) is then stored in a heat-insulated buffer tank (61) to prevent heat losses.
  • the material to be treated (P) can then be sent in batches ( “batches") or continuously in the enclosure (1) by means, for example, an inlet (43) in order to undergo the final phase of the heat treatment by exposure to a microwave field from at least one generator (20) and transmitted by waveguide (s) (21) and flange (s) (33) systems.
  • a control of the heat treatment can be achieved, for example, by the openings (4a). This control may, for example, consist in following the temperature of the material using a pyrometer or any other means of measuring the temperature, in order to optimize the instant of emptying, for example, by tilting or pivoting of the the enclosure (1).
  • the treated material (Pe) can then be evacuated, for example, through the orifice (4b) in a cooler (44).
  • a fan (45) can force the air to circulate against the current to better exchange the heat of the treated product (Pe).
  • the hot air thus obtained can be sent via a pipe (42) to the heater (41).
  • the cooled treated material (Pe) can then be stored in a silo (46).
  • a major advantage of this embodiment of the device according to the invention is to greatly increase the production capacity.
  • Microwave technology is limited in power by commercially available industrial generators, that is to say about 100kW for a frequency of about 915 MHz. Even if the possible use of two generators on a cavity doubles this power, the industrial production capacities are limited.
  • the proposed solution makes it possible to greatly increase the production capacity and to make possible high capacity industrial applications.
  • Another advantage of this embodiment of the device according to the invention is to optimize the cost price by reserving the " high-end " microwave process for the technical phase of the transformation can only be done by this method.
  • the entire upstream heating phase is realized, where possible, by a conventional, lower cost process.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
EP12170326.8A 2011-05-31 2012-05-31 Vorrichtung zur Wärmebehandlung, insbesondere von getrennten Materialien, zumindest durch Mikrowellenstrahlung Not-in-force EP2530059B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1154785A FR2976061B1 (fr) 2011-05-31 2011-05-31 Dispositif de traitement thermique, en particulier de materiaux divises, au moins par rayonnement micro-ondes

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EP2530059A1 true EP2530059A1 (de) 2012-12-05
EP2530059B1 EP2530059B1 (de) 2014-12-31

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3003181A1 (fr) * 2013-03-18 2014-09-19 Innovation & Dev Company Idco Procede et installation d'extraction de produits biologiques par micro-ondes.
FR3017308A1 (fr) * 2014-02-10 2015-08-14 Idco Dispositif et procede d'extraction de produits biologiques par micro-ondes et ultrasons
FR3032590A1 (fr) * 2015-01-14 2016-08-12 Erpim Dispositif perfectionne a cuve rotative pour le traitement d'un produit par micro-ondes
EP2625482A4 (de) * 2010-10-07 2017-06-07 Milt D. Mathis Mikrowellen-drehrohrofen
WO2018115296A1 (fr) 2016-12-22 2018-06-28 Antofenol Préparation d'un extrait de biomasse sèche riche en polyphenols
CN111139099A (zh) * 2020-01-19 2020-05-12 北京诺芯环境科技有限公司 一种微波热解设备
FR3136385A1 (fr) * 2022-06-14 2023-12-15 Innovation & Development Company dispositif de chauffage par micro-ondes et à lit fluidisé pour le traitement thermique de produits végétaux ou organiques
WO2023242289A1 (fr) 2022-06-17 2023-12-21 Colas Procédé de production industrielle d'argiles calcinées
WO2023242290A1 (fr) 2022-06-17 2023-12-21 Colas Procédé de production industrielle d'anhydrite artificielle
WO2023242286A1 (fr) 2022-06-17 2023-12-21 Colas Procédé de production industrielle d'un enrobé à chaud
FR3139188A1 (fr) * 2022-08-29 2024-03-01 Innovation & Development Company four de calcination par micro-ondes pour matériaux solides divisés en fines particules

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3907248A1 (de) * 1989-03-07 1990-09-13 Kirchhoff Gmbh F Muldentrockner fuer schuettgut, insbesondere asphaltgranulat
FR2647292A1 (fr) * 1989-05-19 1990-11-23 Moritz Sa Procede et installation de chauffage par micro-ondes d'un produit pulverulent, pateux ou granuleux soumis a agitation
WO2004068906A1 (fr) 2003-01-24 2004-08-12 Entema Procede et installation pour le chauffage de granules par un rayonnement micro-ondes
WO2004068907A1 (fr) 2003-01-24 2004-08-12 Entema Dispositif de chauffage par rayonnement micro-ondes et procede de mise en oeuvre

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3907248A1 (de) * 1989-03-07 1990-09-13 Kirchhoff Gmbh F Muldentrockner fuer schuettgut, insbesondere asphaltgranulat
FR2647292A1 (fr) * 1989-05-19 1990-11-23 Moritz Sa Procede et installation de chauffage par micro-ondes d'un produit pulverulent, pateux ou granuleux soumis a agitation
WO2004068906A1 (fr) 2003-01-24 2004-08-12 Entema Procede et installation pour le chauffage de granules par un rayonnement micro-ondes
WO2004068907A1 (fr) 2003-01-24 2004-08-12 Entema Dispositif de chauffage par rayonnement micro-ondes et procede de mise en oeuvre

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2625482A4 (de) * 2010-10-07 2017-06-07 Milt D. Mathis Mikrowellen-drehrohrofen
US11425800B2 (en) 2010-10-07 2022-08-23 Milt Mathis Microwave rotary kiln
FR3003181A1 (fr) * 2013-03-18 2014-09-19 Innovation & Dev Company Idco Procede et installation d'extraction de produits biologiques par micro-ondes.
FR3017308A1 (fr) * 2014-02-10 2015-08-14 Idco Dispositif et procede d'extraction de produits biologiques par micro-ondes et ultrasons
FR3032590A1 (fr) * 2015-01-14 2016-08-12 Erpim Dispositif perfectionne a cuve rotative pour le traitement d'un produit par micro-ondes
WO2018115296A1 (fr) 2016-12-22 2018-06-28 Antofenol Préparation d'un extrait de biomasse sèche riche en polyphenols
CN111139099A (zh) * 2020-01-19 2020-05-12 北京诺芯环境科技有限公司 一种微波热解设备
FR3136385A1 (fr) * 2022-06-14 2023-12-15 Innovation & Development Company dispositif de chauffage par micro-ondes et à lit fluidisé pour le traitement thermique de produits végétaux ou organiques
WO2023242289A1 (fr) 2022-06-17 2023-12-21 Colas Procédé de production industrielle d'argiles calcinées
WO2023242290A1 (fr) 2022-06-17 2023-12-21 Colas Procédé de production industrielle d'anhydrite artificielle
WO2023242286A1 (fr) 2022-06-17 2023-12-21 Colas Procédé de production industrielle d'un enrobé à chaud
FR3136793A1 (fr) 2022-06-17 2023-12-22 Colas Procédé de production industrielle d’un enrobé à chaud
FR3136766A1 (fr) 2022-06-17 2023-12-22 Colas Procédé de production industrielle d’argiles calcinées
FR3136757A1 (fr) 2022-06-17 2023-12-22 Colas Procédé de production industrielle d’anhydrite artificielle
FR3139188A1 (fr) * 2022-08-29 2024-03-01 Innovation & Development Company four de calcination par micro-ondes pour matériaux solides divisés en fines particules
WO2024047295A1 (fr) * 2022-08-29 2024-03-07 Innovation & Development Company Four de calcination par micro-ondes pour matériaux solides divisés en fines particules

Also Published As

Publication number Publication date
FR2976061B1 (fr) 2013-08-23
FR2976061A1 (fr) 2012-12-07
EP2530059B1 (de) 2014-12-31

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